Corals shrinking immediately after I bought them

[kamranfareedi]

Hi, I just bought a big coral. At least, it looked big when I saw it in the store. However, now that I've brought it home, it immediately shrunk when I put it in the tank. Is that normal? How long will it take to return to its normal size?

Thanks.

 

[kamranfareedi]

Here's a photo of the coral